# Business phone systems for enterprise buyers: what AI models recommend, October 2026

Gane Index, October 2026 Edition. Asked as "business phone system" and as "UCaaS platform", six framings each, to fourteen models with search on, on behalf of an enterprise B2B company. Added to the October 2026 Edition on October 4, 2026. Page: https://www.gane.ai/index/it/operations/business-phone-systems/2026-10/enterprise

This is the permanent record of the October 2026 Edition, published October 1, 2026 and superseded since. The current standing: https://www.gane.ai/index/it/operations/business-phone-systems/enterprise/index.md

**Standing:** RingCentral RingEX leads with 43% of first choices; verdict clear leader. 58 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [RingCentral RingEX](https://www.gane.ai/index/it/vendors/ringcentral-ringex/index.md) | 43% | 3% | 62 |
| 2 | [Microsoft Teams Phone](https://www.gane.ai/index/it/vendors/microsoft-teams-phone/index.md) | 31% | 4% | 54 |
| 3 | [Zoom Phone](https://www.gane.ai/index/it/vendors/zoom-phone/index.md) | 5% | 7% | 44 |
| 4 | [Nextiva](https://www.gane.ai/index/it/vendors/nextiva/index.md) | 5% | 7% | 28 |
| 5 | [8x8](https://www.gane.ai/index/it/vendors/8x8/index.md) | 2% | 11% | 35 |
| 14 | [Cisco Webex Calling](https://www.gane.ai/index/it/vendors/cisco-webex-calling/index.md) | 0% | 0% | 20 |
| 15 | [Cisco Webex](https://www.gane.ai/index/it/vendors/cisco-webex/index.md) | 0% | 0% | 13 |
| 17 | [Dialpad](https://www.gane.ai/index/it/vendors/dialpad/index.md) | 0% | 14% | 14 |
| 74 | [Mitel](https://www.gane.ai/index/it/vendors/mitel/index.md) | 0% | 73% | 11 |
| 76 | [Avaya](https://www.gane.ai/index/it/vendors/avaya/index.md) | 0% | 85% | 13 |

Rank is by share of first choices among all 76 products named; products with the same share are tied, and the order among them carries no meaning. The table lists those with at least 10 labels.

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: no first choice
- GPT-5.4 mini: RingCentral RingEX; alternatives 8x8, Cisco Webex Calling, Genesys Cloud CX, Microsoft Teams Phone
- Gemini 3.5 Flash: RingCentral RingEX; alternatives 8x8, Dialpad, Microsoft Teams Phone, Zoom Phone
- Perplexity Sonar: RingCentral RingEX; alternatives 8x8, CloudTalk, Nextiva, Zoom Phone
- Grok 4.20: no first choice; alternatives 8x8, Cisco, Microsoft Teams Phone, RingCentral RingEX
- Mistral Small: Cisco Unified Communications Manager, RingCentral Office, RingCentral Ultra; alternatives 8×8 Work
- DeepSeek V4 Flash: RingCentral RingEX; alternatives 8x8, Cisco Webex Calling, Microsoft Teams Phone, Zoom Phone
- Llama 4 Maverick: RingCentral RingEX; alternatives Nextiva
- Qwen 3.7 Flash: Microsoft Teams Phone; alternatives Dialpad, Five9, RingCentral RingEX, Salesforce Voice
- Kimi K2: RingCentral RingEX; alternatives 8x8, Microsoft Teams Phone, Nextiva
- GLM 4.7 FlashX: RingCentral RingEX; alternatives 8x8, Cisco Unified Communications Manager, Mitel, Nextiva
- MiniMax M2.5: Microsoft Teams Phone, RingCentral RingEX; alternatives Cisco
- GPT-6 Luna: RingCentral RingEX; alternatives Teams Phone, Zoom Phone
- Muse Glimmer 30B: RingCentral RingEX; alternatives Nextiva, Zoom Phone

## Sources the answers cite

78 of 84 answers came back with a source list, from 14 of 14 models. Sites named in the most answers:

- expertmarket.com: 45 answers, 53 citations
- nextiva.com: 33 answers, 52 citations
- ringcentral.com: 33 answers, 52 citations
- justcall.io: 26 answers, 30 citations
- crazyegg.com: 26 answers, 27 citations
- getvoip.com: 24 answers, 29 citations
- techrepublic.com: 22 answers, 26 citations
- cloudtalk.io: 21 answers, 24 citations

Pages named in the most answers:

- https://expertmarket.com/phone-systems/best-enterprise-phone-systems (30 answers)
- https://crazyegg.com/blog/best-business-phone-systems (24 answers)
- https://resources.rework.com/tools/business-phone/best-business-phone-system-2026 (15 answers)
- https://thenetworkinstallers.com/blog/phone-systems (15 answers)
- https://expertmarket.com/phone-systems/ucaas-providers (14 answers)
- https://financesonline.com/business-phone-systems (13 answers)
- https://techrepublic.com/article/best-business-phone-systems (13 answers)
- https://vendorbenchmark.com/blog/unified-communications-pricing-benchmark-enterprise (13 answers)
- https://business.com/categories/business-phone-systems (11 answers)
- https://getvoip.com/blog/ucaas-providers (11 answers)

## Warned against

- Avaya: 11 of 13 labels negative. "Older proprietary hardware PBX platforms such as Avaya, Panasonic, Mitel, and NEC: These are described as legacy on-premises systems ... "not recommended for new installations."" (Perplexity Sonar, negative prompt)
- Mitel: 8 of 11 labels negative. "Mitel went through Chapter 11 in 2025, ended design support for its MiVoice Connect phones on December 31, 2025, and permanently shut down its MiCloud Connect cloud platform on June 24, 2026." (Muse Glimmer 30B, comparative prompt)
- NEC: 8 of 8 labels negative. "Legacy On-Premises PBX systems from vendors like Avaya, Panasonic, Mitel, and NEC, which have filed for bankruptcy or exited the business phone market." (Llama 4 Maverick, negative prompt)
- Panasonic: 5 of 5 labels negative. "Legacy On-Premises PBX systems from vendors like Avaya, Panasonic, Mitel, and NEC, which have filed for bankruptcy or exited the business phone market." (Llama 4 Maverick, negative prompt)

## Record

- Method: https://www.gane.ai/index/it/methodology
- License: CC BY 4.0. Cite as Gane Index, October 2026 Edition, www.gane.ai/index/it.